Here is a very simple idea: next time you talk to one of your friends who works at FB/Goog/etc. ask them pointedly how they can work at a place which obviously lacks any morals/ethics. Their first reaction would be to defend their actions, of course, but if a few people start doing this, my guess is that the message will start going up slowly but surely.
After all, what are they going to do? Stop having friends?
Those are the words that the head honchos at FB/Goog/.. etc are telling themselves about the viability of their privacy violations. At this point, no shame in turning it against them.